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Decouple public, internal act implementation (#19745)
In the next major release, we intend to drop support for using the `act` testing helper in production. (It already fires a warning.) The rationale is that, in order for `act` to work, you must either mock the testing environment or add extra logic at runtime. Mocking the testing environment isn't ideal because it requires extra set up for the user. Extra logic at runtime is fine only in development mode — we don't want to slow down the production builds. Since most people only run their tests in development mode, dropping support for production should be fine; if there's demand, we can add it back later using a special testing build that is identical to the production build except for the additional testing logic. One blocker for removing production support is that we currently use `act` to test React itself. We must test React in both development and production modes. So, the solution is to fork `act` into separate public and internal implementations: - *public implementation of `act`* – exposed to users, only works in development mode, uses special runtime logic, does not support partial rendering - *internal implementation of `act`* – private, works in both development and productionm modes, only used by the React Core test suite, uses no special runtime logic, supports partial rendering (i.e. `toFlushAndYieldThrough`) The internal implementation should mostly match the public implementation's behavior, but since it's a private API, it doesn't have to match exactly. It works by mocking the test environment: it uses a mock build of Scheduler to flush rendering tasks, and Jest's mock timers to flush Suspense placeholders. --- In this first commit, I've added the internal forks of `act` and migrated our tests to use them. The public `act` implementation is unaffected for now; I will leave refactoring/clean-up for a later step.
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